[Metastasizing soft tissue tumor of light damaged skin: atypical fibroxanthoma or malignant fibrous histiocytoma?].

A 86-year-old female patient presented with a ca. walnut-sized, centrally ulcerated preauricular tumor on the right side as well as a firm submandibular lymph node. Histology disclosed a soft-tissue tumor breaking into the lymph node consisting partly of fibroblast-like and partly of histiocyte-like cells. Clinical and histological criteria speak for both an atypical fibroxanthoma (AFX) as well as a malignant fibrous histiocytoma (MFH). A differentiation into two entities does not appear appropriate in our opinion. As the term "AFX" is classified as a benign tumor, "metastasizing AFX" (mAFX) should be considered a special form of MFH or be diagnosed as such, respectively.